US3601057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arming switch
Assignee: GIBBS Manufacturing AND RESEARCH CORP
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Filing: 1969-02-11
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Granted: 1971-08-24
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Expires: 1989-02-11
Abstract
Abstract An arming switch for making an electrical circuit through connections thereto upon a sudden reduction in ambient pneumatic pressure. A pair of parallel connected contact blades spring loaded toward a stationary contact are held separated therefrom by a skirted piston in a cylinder. The cylinder behind the piston normally fill to ambient pressure around the skirt. Whenever there is a sudden reduction in ambient pressure, the pressure differential across the piston moves the piston away from the blades and permits the blades to close against the stationary contact. Inherent leakage around the piston prevents gradual ambient pressure changes from producing arming action.
Inventors
- 👤 Ralph S Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/06; F42C5/00; F42C5/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
267 words
An arming switch for actuation upon an abrupt decrease in ambient pressure comprising electrical contact means spring loaded to one position when free, means providing a cylinder enclosing said contact means, said cylinder having a closed end and an open end, a piston movable in said cylinder and positioned toward the open end thereof relative to said contact means, said piston having pliable skirt engaging the interior surface of said cylinder, said skirt facing the closed end of said cylinder to permit gas to collapse said skirt slightly and flow around said piston from the open end of said cylinder to the closed end thereof to substantially equalize the pressures at the closed and open ends of said cylinder when the pressure at said open end tends to rise above the pressure at said closed end, said skirt substantially sealing against said cylinder surface to prevent flow from the closed end of said cylinder to the open end thereof when the pressure at said closed end is higher than at said open end, said piston when in one position toward said closed end engaging said contact means and holding said contact means in a position other than said contact one position, said piston when moved toward said open end freeing said contact means to move to said contact one position under the influence of said spring loading, said piston moving away from said piston one position toward the open end of said cylinder when the ambient pressure available at the open end of said cylinder abruptly drops a substantially predetermined amount below the previously prevailing ambient pressure.
Claim 2
Dependent Claim
267 words
An arming switch for actuation upon an abrupt decrease in ambient pressure comprising electrical contact means spring loaded to one position when free, means providing a cylinder enclosing said contact means, said cylinder having a closed end and an open end, a piston movable in said cylinder and positioned toward the open end thereof relative to said contact means, said piston having pliable skirt engaging the interior surface of said cylinder, said skirt facing the closed end of said cylinder to permit gas to collapse said skirt slightly and flow around said piston from the open end of said cylinder to the closed end thereof to substantially equalize the pressures at the closed and open ends of said cylinder when the pressure at said open end tends to rise above the pressure at said closed end, said skirt substantially sealing against said cylinder surface to prevent flow from the closed end of said cylinder to the open end thereof when the pressure at said closed end is higher than at said open end, said piston when in one position toward said closed end engaging said contact means and holding said contact means in a position other than said contact one position, said piston when moved toward said open end freeing said contact means to move to said contact one position under the influence of said spring loading, said piston moving away from said piston one position toward the open end of said cylinder when the ambient pressure available at the open end of said cylinder abruptly drops a substantially predetermined amount below the previously prevailing ambient pressure.
Claim 3
Dependent Claim
57 words
The arming switch called for in claim 1 in which said contact means is a set of normally spring closed contacts and a member on said piston is adapted to lie between said contacts in the piston said one position and to be pulled from between said contacts when said piston moves away from said one position.
Claim 4
Dependent Claim
64 words
The arming switch called for in claim 2 in which the contract means is comprised of a pair of spring blades connected electrically in parallel and a substantially rigid contact member, the blades being spring loaded to engage said substantially rigid member, and the piston when in the said one position being adapted to hold the blades away from the substantially rigid contact member.
Claim 5
Dependent Claim
64 words
The arming switch called for in claim 2 in which the contact means is comprised of at least one spring blade and a second contact member, the blade being spring loaded to engage said second contact member when said contact members are free, and the piston when in the said one position being adapted to hold the blade away from the second contact member.
Claim 6
Dependent Claim
35 words
The arming switch called for in claim 1 in which means providing access to the piston is provided for moving the piston to the piston said one position to reset the switch to unarmed condition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |